Carburetor



Feb. 25,1930.

F. MONIER CARBURETOR Original Filed Oct. 51. 1922 2 Sheets-Sheet 1INVENTOR ii-ands Man/en A TTORNE Y3 Feb. 25, 1930. F. MONIER CARBURETOROriginal Filed Oct. 51. 1922 I 'INYENTOR .7- fianc/kMan/er 2Sheets-Sheet p.-t.....d ,,1-.t. as, 1930 UNITED sures.

. nan-2N1 OFFICE more roman, or nnurLLr-sun-snmn, men

l cannnnnron Original application filed October 81, 1988, Serial No.588,084, and in France iiovember 5, i921. Divided i and out applicationfiled October 15, 1924. Serial No. 143,650.

. My invention relates to carburetors and a method of regulating orcorrecting the ac,- tion of the same described in my ap heation forpatent filed October 31,1922, 01:19.]

5 No. 598,084, of which the present a pl1c at1on is a division. In saidprior app lcation I have described a carburetor in which the amount offuel, suchas liquid hydrocarbon,

' fed through a suitable orifice or spray nozzle for mixture with air,depends upon dlfferences of depression or suction at-two nozzles oroutlets openin into the suction tube or Venturi tube oft e carburetor,one of said outlets being the spray. nozzle .and con- 16 nected as usualwith t e odyof the fuel held at constant level in a suitable sealedcontainer, and the other opemng atv a dlfierent point or position in thesaid suction tube and connected with the closed space above the 20 levelof\the liquid, said difference of depression or suction at said outletsbeing affected by or dependent upon the amount of suction exerted by theengme according to dlfierences in the opening ofthe throttle and said(hi- 86 ference of depression or suction increasing as the air flow orsuction of the engine mcreases and vice versa. 7 p The object of thepresent invention is to rovide an adjustment or correction for dif- 3oerent conditions affecting the carburatlon, such as temperature of air,quahty of fuel and the like, to which end my nvention "consistsessentially in regulating or ad ust:

ing the depression acting on the surface of the liquid bymeans of anaddltlonal or supplemental depression tube having an outlet into thesuction tube at or near the spray nozzle or region of maximum depressionand having preferably a larger cross-sectlon than the difi'erentialdepression element which acts upon the space above the l1qu1d level andopens. into the suction tube at a point removed from the point ofmaximum depression or location ofthespray nozzle, the sand able devicefor regu ating its flow section.

The said regulating device is more or less opened to produce a variationin the differ-' ential effect acting on the carburctor,-and oneadditional tube bein provided with a suitmay correct the output of thecarburetor vaccording to requirements,"'while the carburetor retains itsautomatic action for different speeds. The engine throttle is obviouslyplaced between the air inlet and the fuel'nozzle for difierentialdepressions and corrections. 7

The differential depression element acting normally on the. fuel surfaceis insertedeither on the engine side of the region of maximum depressionor on the farther side of the same. In other words it is applied in thediffuser or suction tube at a point between the restricted or narrowpart of the same and either end thereof, or at both points the two beingin the latter case connected together.

According to my present invention th said differential depressionelement if in-' serted'or applied on the engine side of the narrow partor portion of maximum depression in the suction tube or diffuser, islocated at a distance from said narrow part approximately equal to twicethe diameter of said narrow part. If applied at the opposite or outwardside of said narrow art it is preferably located at a distance from saidnarrow part approximately equal to the diameter thereof divided by 1r.

Another part of my invention relates to the means for momentarily addingfuel to the mixture when the throttle is opened to resume speed andconsists essentially in the provision of a supplemental air inletleading into a fuel chamber having a spray outlet, a supplemental needlevalve controlling said air inlet and means connected with the throttlefor actuating said needle valve, all as more particularly hereinafterdescribed. I

Fig. 1 illustrates in a diagrammatical fashion the principle of thepresent invention as embodied in a carburetor shown in vertical section.

Fig. 2 is a vertical section of a practical form of constructionembodying the inven tion taken on the line 2222 Fig. 3 and in which thesuction or .difluser tube or con- 'duit is disposed. horizontally.

Fig. 3 is a horizontal s'ectionon the line 333--3 of Fig. 2.

. Fig. 4 is a vertical section on the line of Flg. 2 and on the line4'4' of Fig. 3.

Fig. 5 is a vertical section on the line 5-5 of Fig. 4.

Fig. 6 is a partial section on'the line 6'-6 Fig. 4. v

Fig. 7 is a horizontal section on the line 7-7 of Fig. 5. I

Fig. 8 is a view similar to Fig. 1' showing a slight modification of myinvention.

Referrin to Fig. 1, the suction or Venturi tube 0 the carburetor isshown as consisting preferably of two flaring or funnelshaped or conicalsections 13 and 12 whose smaller ends are juxtaposed thus producing atsaid ends a restricted section in the suction tube and a region in whichthe depression produced by the suction of the engine is a maximum. Thewide end of section 13 connects with the engine.

The anterior'throttle is typified at 19 as 'a cone which works along theaxis of the tube and serves to vary the size of the opening throughwhich air is drawn by the engine suction. The liquid fuel is containedin tank or reservoir typified at 1, in which a constant level ismaintained-by the automatic action of a float or other means and thespace above the liquid is normally sealed or closed. With said space apipe or tube 11 connects and leads to an outlet in the suction tube forproducing a variable depression on the surface of theliquid, while anat60 (Fig. 1)

other tube 5 connects withthe body of the liquid and feeds'the same atan orifice 8 into a chamber 16 which has an outlet 14 into the suctiontube operating as the spray nozzle.

By these means the varying difference of,

depression producing flow of fuel into the suction tube is obtained asdescribed more particularly in my original application. Preferably thechamber 16 is an annular chamber in the wall of the suction tubeand thespraynozzle 14 is a narrow annular outlet between the tube sections 12,13.

According to my present invention the suction tube 11 communicating withthe s ace above the fuel is inserted at 59 (into t e Venturitube) Fig.8) at a distance it from the narrow part of the diffuser 14 which isequal to the diameter of said narrow part divided by 1r. It mi ht alsobe inserted at a distance H from the narrow part 14 of the diffuserwhich is equal to double the diameter of' said narrow part. A second orsupplemental depression element .is connected with the closed spaceabove the body of fuel and has its .outlet61 at the level of the narrowpart of the diffuser or suction tube and opens into the chamber 16. Thedepression afforded by this second element is therefore greater thanthat afforded by the pipe 11. The elementof which 61 is the outletcommunicates with the space above the liquidin the float chamber 1through a com following effect duit 62*whose cross-section is greaterthan that of the depression conduit 11. On the conduit 62 is mounted acock 63 controlling the effective area of the conduit 62. v Thecorrecting element comprising the depression= by reducing the feed tothe nozzle. If said cock is fully opened the depression on the liquidsurface will be equal to the depression exertedat its lower part by thenozzle 8 and the feed to the latter will be entirely cut' 011'.

By reason of the location of the depression element at 59 as stated, theeffect of depression upon said element will be maintained when the saidvalve or core 19 enters the converging cone of the diffuser. At thismo-- ment, in fact, due to the partial closin of the diffuser, only asmall amount of air ows in the latter, so that the effect-in thediverging part becomes very small. On the contrary, between theconverging cone 12 of'the diffuser and the core 19 the small quantity,of air admitted has a high speed due to the diminutionof theflowsection. This speed of the air acts to maintain the dynamiceffeet onthe element 59 at a high value; with suitable dimensions of thecarburetor parts,- this value could be maintained substantially constantirrespective of the amount to which the throttle 19 is closed.

Referring now to the practical form of construction shown in Figs. 2, 3,and 4, the ele-.

ments as indicated in the greater part of the preceding figures will berecognized. The

conduit connecting the. depression element 59 lie with the float chamber1 is formed in the converging cone 12 of the diffuser; it communicatesby a circular groove 59' with the and'iscontrolled by the cook 63 forermit-* ting the depression in chamber'16 to communicated to the upperpart of the float chamber when the throttle valve 19 is in substantiallyclosed position. The cock 63 has a tapered shape, being urged upon itsseat by a spring 64 and controlled by a lever 65';

it has a wedge-shaped recess providing for 5 the gradual openin andclosing of the conduit 62. The portion 60 of the depression element isshown in the form of a conduit composed of an air inlet 67 connectedwith the chamber 16 into which opens the nozzle 8. (Figs; -2, 4, 5, and6). A needle valve 68 controls said inlet in connection with a spring69. A toe 70 on the shaft 21 of the lever controlling the core 19 acts,when the said core is lowered to open, the needle 68 by bearing upon ashoulder 71 on the stem of the needle 68, Figs. 5, 6, and 7,therebyholding 0 en the said compensating device 67 Upon c osing thevalve formed b the core 19, the toe70 moves together wit the said needleas impelled by the spring 69. The hole 67 of the compensating device isnow closed and the chamber 16 may be partially filled with liquid fueL-Should the core 19 now be moved to open position, the hole 67 will alsobe opened, and the fuel in the chamber 16 said valve cooperating withsaidrestricted part to produce a rapid flow of air in said restrictedpart when said 'valve approaches closed position, a closed fuelreservoir, means for maintaining a substantially constant height of fueltherein, a fuel conductor connecting said reservoir beneath the normalfuel level therein with the restricted portion of said intake pipe, asecond fluid conductor connecting the space above the normal fuel levelin said reservoir with the intake pipe at a point of less than themaximum depression therein, a third fluid conductor connecting the spaceabove the normal fuel level in said reservoir with the part of maximumde-- pression in said intake pipe, means for controlling the passagethrough said third .conductor and means for controlling said valve.Signedat Paris, France, this 3rd day of Oct-o er, A. D. 1924.

4 FRANCIS MONIER.

can proceed into the diffuser, thus facilitating the resumption of,speed by a momentary as addition of fuel to the gas mixture.

The conicalor flaring sections 12, 13 of the suction tube may be securedin position in the carburetor body 53 in the manner indicated in Figs. 3and 4. The float of the float feed tank is indicated at 36. The conicalvalve 19 may'work on a guide rod 42 and be actuated by a rock shaft 21carrying an arm or arms 20 or may be guided and actuated' in any otherdesired way. What I'claimas my invention is 1. In' combination, anintake pipe provided with a restricted part, said restricted part,producing an-area of maximum depression upon air flow through saidintake pipe, a control valve operatively positioned in said intake pipein front of said restricted art, said valve-cooperating with saidrestrlcted part to produce a rapid-flow of air in said restricted partwhen said valve approaches closed position, a closed fuel reservoir,means for maintaining a substantially constant height of fuel therein, afluid conductor connecting said reservoir beneath the normal fuel leveltherein with the restricted portion" of-said intake pipe, a second fluldconductor I connecting the spaceabove the normal fuel level in saidreservoir with the intake pipe at a point of less than the maximumdepression therein, a third fluid conductor connecting the space abovethe normal fuel level in said reservoir with the part of maximumdepression in said intake pipe, and means for controlling the passagethrough said third conductor.

'2. In combination, an intake pipe provided with arestricted part, saidrestricted part producing an area of maximum depression upon air flowthrough said intake pipe, a control valve-operatively positioned in saidintake pipe in front of said restricted part,

